Question 1

Which of the following statements best describes the physical properties of alkanes?

Accepted Answer

Their melting points increase with increasing chain length.

Question 2

What is the correct IUPAC name for the compound shown in image 2?

Accepted Answer

2,4,5-trimethylheptane

Question 3

A carbon-carbon double bond in an alkene consists of:

Accepted Answer

One sigma/hybrid bond and one pi bond

Question 4

How many secondary carbons are present in the molecule shown in image 2?

Accepted Answer

2

Question 5

Which of the following is an isomer of the molecule shown in image 1?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 6

An unsaturated hydrocarbon is one that:

Accepted Answer

Has C=C double bonds.

Question 7

What is the bond angle at the carbon indicated by the arrow in image 3 (a fragment of Polymixin B2)?

Accepted Answer

$$109.5^\circ$$

Question 8

Monochlorination of pentane leads to the formation of how many different halogenated products?

Accepted Answer

3

Question 9

The two molecules shown in image 4 are:

Accepted Answer

Structural isomers

Question 10

Cis-trans isomerism occurs when:

Accepted Answer

The carbons in an alkene double bond each have two different substituent groups.

Question 11

Which of the following compounds has the lowest boiling point?

Accepted Answer

cis-2-butene

Question 12

The atoms marked 'B' in image 6 are in the:

Accepted Answer

Equatorial position

Question 13

What type of reaction is shown in image 7?

Accepted Answer

Substitution

Question 14

What is the IUPAC name of the compound shown in image 8?

Accepted Answer

trans-3-chloro-2-pentene

Question 15

When an alkene undergoes a hydration reaction, the product is an:

Accepted Answer

Alcohol

Question 16

The stage in a polymerization reaction shown in image 5 is:

Accepted Answer

Propagation

Question 17

The name of the polymer formed from $$\mathrm{CH_2$=CH_2$} is$$:

Accepted Answer

Polyethylene

Question 18

Hydrohalogenation of 3-methyl-1-butene with HCl would yield what major product?

Accepted Answer

2-chloro-3-methylbutane

Question 19

What is the correct IUPAC name for the compound shown in image 9?

Accepted Answer

4-benzyloctane

Question 20

What is the IUPAC name of the molecule shown in image 10?

Accepted Answer

1,1-dimethylcyclobutane

CHMY 123 Mid-term Practice: Organic Chemistry Concepts and Nomenclature

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